commit df4ea7091b744c8568e8bd9212a756ac504c43d4
author Max Reitz <mreitz@redhat.com> Tue Oct 27 20:05:46 2020 +0100
committer Kevin Wolf <kwolf@redhat.com> Fri Dec 11 17:52:40 2020 +0100
tree 4bb9ba1819d02bb97343e03def3f6ca06ac54251
parent 4ca37a96a75aafe7a37ba51ab1912b09b7190a6b

fuse: Implement hole detection through lseek

This is a relatively new feature in libfuse (available since 3.8.0,
which was released in November 2019), so we have to add a dedicated
check whether it is available before making use of it.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20201027190600.192171-7-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

meson.build

diff --git a/meson.build b/meson.build
index 6e8ef15..f344b25 100644
--- a/meson.build
+++ b/meson.build
@@ -773,10 +773,28 @@
     have_vhost_user_blk_server = false
 endif
 
+if get_option('fuse').disabled() and get_option('fuse_lseek').enabled()
+  error('Cannot enable fuse-lseek while fuse is disabled')
+endif
+
 fuse = dependency('fuse3', required: get_option('fuse'),
                   version: '>=3.1', method: 'pkg-config',
                   static: enable_static)
 
+fuse_lseek = not_found
+if not get_option('fuse_lseek').disabled()
+  if fuse.version().version_compare('>=3.8')
+    # Dummy dependency
+    fuse_lseek = declare_dependency()
+  elif get_option('fuse_lseek').enabled()
+    if fuse.found()
+      error('fuse-lseek requires libfuse >=3.8, found ' + fuse.version())
+    else
+      error('fuse-lseek requires libfuse, which was not found')
+    endif
+  endif
+endif
+
 #################
 # config-host.h #
 #################
@@ -812,6 +830,7 @@
 config_host_data.set('CONFIG_MALLOC_TRIM', has_malloc_trim)
 config_host_data.set('CONFIG_STATX', has_statx)
 config_host_data.set('CONFIG_FUSE', fuse.found())
+config_host_data.set('CONFIG_FUSE_LSEEK', fuse_lseek.found())
 config_host_data.set('QEMU_VERSION', '"@0@"'.format(meson.project_version()))
 config_host_data.set('QEMU_VERSION_MAJOR', meson.project_version().split('.')[0])
 config_host_data.set('QEMU_VERSION_MINOR', meson.project_version().split('.')[1])
@@ -2214,6 +2233,7 @@
 summary_info += {'rng-none':          config_host.has_key('CONFIG_RNG_NONE')}
 summary_info += {'Linux keyring':     config_host.has_key('CONFIG_SECRET_KEYRING')}
 summary_info += {'FUSE exports':      fuse.found()}
+summary_info += {'FUSE lseek':        fuse_lseek.found()}
 summary(summary_info, bool_yn: true)
 
 if not supported_cpus.contains(cpu)